1 /*
2 * linux/include/linux/sunrpc/sched.h
3 *
4 * Scheduling primitives for kernel Sun RPC.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
9 #ifndef _LINUX_SUNRPC_SCHED_H_
10 #define _LINUX_SUNRPC_SCHED_H_
11
12 #include <linux/timer.h>
13 #include <linux/sunrpc/types.h>
14 #include <linux/spinlock.h>
15 #include <linux/wait.h>
16 #include <linux/workqueue.h>
17 #include <linux/sunrpc/xdr.h>
18
19 /*
20 * This is the actual RPC procedure call info.
21 */
22 struct rpc_procinfo;
23 struct rpc_message {
24 struct rpc_procinfo * rpc_proc; /* Procedure information */
25 void * rpc_argp; /* Arguments */
26 void * rpc_resp; /* Result */
27 struct rpc_cred * rpc_cred; /* Credentials */
28 };
29
30 struct rpc_call_ops;
31 struct rpc_wait_queue;
32 struct rpc_wait {
33 struct list_head list; /* wait queue links */
34 struct list_head links; /* Links to related tasks */
35 struct list_head timer_list; /* Timer list */
36 unsigned long expires;
37 };
38
39 /*
40 * This is the RPC task struct
41 */
42 struct rpc_task {
43 #ifdef RPC_DEBUG
44 unsigned long tk_magic; /* 0xf00baa */
45 #endif
46 atomic_t tk_count; /* Reference count */
47 struct list_head tk_task; /* global list of tasks */
48 struct rpc_clnt * tk_client; /* RPC client */
49 struct rpc_rqst * tk_rqstp; /* RPC request */
50 int tk_status; /* result of last operation */
51
52 /*
53 * RPC call state
54 */
55 struct rpc_message tk_msg; /* RPC call info */
56 __u8 tk_garb_retry;
57 __u8 tk_cred_retry;
58
59 /*
60 * callback to be executed after waking up
61 * action next procedure for async tasks
62 * tk_ops caller callbacks
63 */
64 void (*tk_callback)(struct rpc_task *);
65 void (*tk_action)(struct rpc_task *);
66 const struct rpc_call_ops *tk_ops;
67 void * tk_calldata;
68
69 unsigned long tk_timeout; /* timeout for rpc_sleep() */
70 unsigned short tk_flags; /* misc flags */
71 unsigned long tk_runstate; /* Task run status */
72 struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could
73 * be any workqueue
74 */
75 struct rpc_wait_queue *tk_waitqueue; /* RPC wait queue we're on */
76 union {
77 struct work_struct tk_work; /* Async task work queue */
78 struct rpc_wait tk_wait; /* RPC wait */
79 } u;
80
81 unsigned short tk_timeouts; /* maj timeouts */
82 size_t tk_bytes_sent; /* total bytes sent */
83 unsigned long tk_start; /* RPC task init timestamp */
84 long tk_rtt; /* round-trip time (jiffies) */
85
86 pid_t tk_owner; /* Process id for batching tasks */
87 unsigned char tk_priority : 2;/* Task priority */
88
89 #ifdef RPC_DEBUG
90 unsigned short tk_pid; /* debugging aid */
91 #endif
92 };
93 #define tk_xprt tk_client->cl_xprt
94
95 /* support walking a list of tasks on a wait queue */
96 #define task_for_each(task, pos, head) \
97 list_for_each(pos, head) \
98 if ((task=list_entry(pos, struct rpc_task, u.tk_wait.list)),1)
99
100 #define task_for_first(task, head) \
101 if (!list_empty(head) && \
102 ((task=list_entry((head)->next, struct rpc_task, u.tk_wait.list)),1))
103
104 typedef void (*rpc_action)(struct rpc_task *);
105
106 struct rpc_call_ops {
107 void (*rpc_call_prepare)(struct rpc_task *, void *);
108 void (*rpc_call_done)(struct rpc_task *, void *);
109 void (*rpc_release)(void *);
110 };
111
112 struct rpc_task_setup {
113 struct rpc_task *task;
114 struct rpc_clnt *rpc_client;
115 const struct rpc_message *rpc_message;
116 const struct rpc_call_ops *callback_ops;
117 void *callback_data;
118 struct workqueue_struct *workqueue;
119 unsigned short flags;
120 signed char priority;
121 };
122
123 /*
124 * RPC task flags
125 */
126 #define RPC_TASK_ASYNC 0x0001 /* is an async task */
127 #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
128 #define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
129 #define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
130 #define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
131 #define RPC_TASK_KILLED 0x0100 /* task was killed */
132 #define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */
133
134 #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
135 #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
136 #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
137 #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
138 #define RPC_IS_SOFT(t) ((t)->tk_flags & RPC_TASK_SOFT)
139
140 #define RPC_TASK_RUNNING 0
141 #define RPC_TASK_QUEUED 1
142 #define RPC_TASK_ACTIVE 2
143
144 #define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
145 #define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
146 #define rpc_test_and_set_running(t) \
147 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
148 #define rpc_clear_running(t) \
149 do { \
150 smp_mb__before_clear_bit(); \
151 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
152 smp_mb__after_clear_bit(); \
153 } while (0)
154
155 #define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
156 #define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
157 #define rpc_clear_queued(t) \
158 do { \
159 smp_mb__before_clear_bit(); \
160 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
161 smp_mb__after_clear_bit(); \
162 } while (0)
163
164 #define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
165
166 /*
167 * Task priorities.
168 * Note: if you change these, you must also change
169 * the task initialization definitions below.
170 */
171 #define RPC_PRIORITY_LOW (-1)
172 #define RPC_PRIORITY_NORMAL (0)
173 #define RPC_PRIORITY_HIGH (1)
174 #define RPC_NR_PRIORITY (1 + RPC_PRIORITY_HIGH - RPC_PRIORITY_LOW)
175
176 struct rpc_timer {
177 struct timer_list timer;
178 struct list_head list;
179 unsigned long expires;
180 };
181
182 /*
183 * RPC synchronization objects
184 */
185 struct rpc_wait_queue {
186 spinlock_t lock;
187 struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */
188 pid_t owner; /* process id of last task serviced */
189 unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */
190 unsigned char priority; /* current priority */
191 unsigned char count; /* # task groups remaining serviced so far */
192 unsigned char nr; /* # tasks remaining for cookie */
193 unsigned short qlen; /* total # tasks waiting in queue */
194 struct rpc_timer timer_list;
195 #ifdef RPC_DEBUG
196 const char * name;
197 #endif
198 };
199
200 /*
201 * This is the # requests to send consecutively
202 * from a single cookie. The aim is to improve
203 * performance of NFS operations such as read/write.
204 */
205 #define RPC_BATCH_COUNT 16
206 #define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
207
208 /*
209 * Function prototypes
210 */
211 struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
212 struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
213 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
214 const struct rpc_call_ops *ops);
215 void rpc_put_task(struct rpc_task *);
216 void rpc_exit_task(struct rpc_task *);
217 void rpc_release_calldata(const struct rpc_call_ops *, void *);
218 void rpc_killall_tasks(struct rpc_clnt *);
219 void rpc_execute(struct rpc_task *);
220 void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
221 void rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
222 void rpc_destroy_wait_queue(struct rpc_wait_queue *);
223 void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
224 rpc_action action);
225 void rpc_wake_up_queued_task(struct rpc_wait_queue *,
226 struct rpc_task *);
227 void rpc_wake_up(struct rpc_wait_queue *);
228 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
229 void rpc_wake_up_status(struct rpc_wait_queue *, int);
230 void rpc_delay(struct rpc_task *, unsigned long);
231 void * rpc_malloc(struct rpc_task *, size_t);
232 void rpc_free(void *);
233 int rpciod_up(void);
234 void rpciod_down(void);
235 int __rpc_wait_for_completion_task(struct rpc_task *task, int (*)(void *));
236 #ifdef RPC_DEBUG
237 void rpc_show_tasks(void);
238 #endif
239 int rpc_init_mempool(void);
240 void rpc_destroy_mempool(void);
241 extern struct workqueue_struct *rpciod_workqueue;
242 void rpc_prepare_task(struct rpc_task *task);
243
244 static inline void rpc_exit(struct rpc_task *task, int status)
245 {
246 task->tk_status = status;
247 task->tk_action = rpc_exit_task;
248 }
249
250 static inline int rpc_wait_for_completion_task(struct rpc_task *task)
251 {
252 return __rpc_wait_for_completion_task(task, NULL);
253 }
254
255 #ifdef RPC_DEBUG
256 static inline const char * rpc_qname(struct rpc_wait_queue *q)
257 {
258 return ((q && q->name) ? q->name : "unknown");
259 }
260 #endif
261
262 #endif /* _LINUX_SUNRPC_SCHED_H_ */
263
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